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This paper presents recent status and some technological issues for the development of human phantoms used for antenna designs from the above-mentioned two perspectives. Furthermore, as a new trend of phantom applications towards future wireless radios, MIMO over-the-air testing (MIMO-OTA) using a phantom and an arm waving dynamic phantom for the assessment of body area network (BAN) systems are briefly...
An experimental investigation of handset MIMO antennas with dual-band operation was performed using the data from a radio propagation test in an urban area of Aalborg city in Denmark and an over-the-air test using a spatial fading emulator. It is concluded from the agreement between MIMO characteristics of the both measurements that the emulator is effective in evaluating handset MIMO arrays in the...
Outdoor MIMO propagation tests were carried out in an urban area in the Danish city of Aalborg in order to investigate some parameters that affect cellular MIMO base-station antennas. We experimentally examined the 2-by-2 MIMO channel responses of base-station arrays with differently-spaced antennas. From these trials, a clear dependence was found between antenna spacing and fading correlation, going...
Outdoor radio propagation experiments are presented at 2.4 GHz, using a handset MIMO antenna with two monopoles and two planar inverted-F antennas (PIFAs), adjacent to a human phantom in browsing stance. The propagation test was performed in an urban area of a city, which resulted in non line-of-sight (NLOS) situations. In our investigation, the 4-by-4 MIMO and SISO channel capacities for the reception...
This paper presents a basic investigation of the power imbalance problem using a dipole array and a handset MIMO model in a browsing situation. Using channel modeling that includes the effects of 3-dimensional angular spectrum and polarization of incident waves, we carried out a Monte Carlo simulation. From the results obtained in this study, estimates of the reduction in channel capacity for different...
This paper gives an overview of results obtained from measurements of different types of multiple-input multiple-output (MIMO) channels. For the indoor case measurements were made at 5.8 GHz from access points (APs) to mobile stations (MSs) at different places in a large open office type room. These measurements led to the so-called room electromagnetics theory, allowing simple modeling of the channel...
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